Should public figures be held to higher moral standards?

Public figures -- like actors, politicians, and athletes -- are often lambasted in the media for committing commonplace wrongs like dishonesty and hypocrisy. Is that fair? If Michele Obama is an outspoken opponent of childhood obesity and lists the things my children and I shouldn't eat, is she a hypocrite for indulging in her Shake Shack? Should I not value Tiger Woods as a professional golfer with exceptional talent because he screwed around on his wife?